CN203606553U - Shooting lens - Google Patents
Shooting lens Download PDFInfo
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- CN203606553U CN203606553U CN201320782287.9U CN201320782287U CN203606553U CN 203606553 U CN203606553 U CN 203606553U CN 201320782287 U CN201320782287 U CN 201320782287U CN 203606553 U CN203606553 U CN 203606553U
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- 230000003287 optical effect Effects 0.000 claims abstract description 44
- 239000000463 material Substances 0.000 claims abstract description 7
- 239000004033 plastic Substances 0.000 claims abstract description 7
- 210000001747 pupil Anatomy 0.000 claims description 8
- 230000004075 alteration Effects 0.000 abstract description 52
- 230000015572 biosynthetic process Effects 0.000 description 19
- 238000005755 formation reaction Methods 0.000 description 19
- 201000009310 astigmatism Diseases 0.000 description 13
- 239000000571 coke Substances 0.000 description 13
- 238000003384 imaging method Methods 0.000 description 10
- 230000000007 visual effect Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 238000005452 bending Methods 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 4
- 206010010071 Coma Diseases 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 210000003128 head Anatomy 0.000 description 3
- 239000004417 polycarbonate Substances 0.000 description 3
- 238000004904 shortening Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 238000000280 densification Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 230000001915 proofreading effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
Abstract
The utility model discloses a shooting lens having advantages of miniaturization, thin shape, small F value, well-corrected aberration, wide field angle, and low costs. By viewing from the object side, the shooting lens is sequentially constituted by a aperture diaphragm; a first lens, which has convex surfaces facing the object side and the image side, and is provided with the positive focal power; a second lens, which is close to an optical axis, has an aspheric concave surface facing the object side and an aspheric convex surface, and has the negative focal power; a falcate-shaped third lens, which is close to the optical axis, has an aspheric convex surface facing the image side and an aspheric concave surface, and has the positive focal power; and a falcate-shaped fourth lens, which is close to the optical axis, has an aspheric concave surface facing the image side and an aspheric convex surface, and the negative focal power The lenses are made of plastic materials, and satisfy the following conditions: 0.56<r1/f<1.10, 0.86<f1/f3<1.41, -5.0<r3/r4<0.1, 2.0<r7/r8<4.8.
Description
Technical field
The utility model relates to the pick-up lens that forms the picture of subject in small-sized camera head on the solid-state imager of a kind of ccd sensor using or C-MOS sensor, especially relate to built-in pick-up lens in the camera head that information terminal apparatus such as portable terminal device such as smart mobile phone or portable telephone and PDA (Personal Digital Assistant, personal digital assistant) growing in miniaturization, slimming etc., game machine or PC etc. carry.
Background technology
In recent years, the situation with the market of portable terminal device headed by smart mobile phone etc. in expanding day, the performance of the camera carrying become main flow corresponding to high pixel.For the pick-up lens corresponding with this camera, strong wish be more high resolving power, miniaturization, slimming and the bright lens system corresponding with the high pixelation of imaging apparatus, can be taken at wide region the lens system of the wide visual field angle of the picture of subject.
As the pick-up lens of trend that adapts to this high performance, the relatively pick-up lens of 4 pieces of formations of miniaturization and high performance of more hope is proposed.
For example, following pick-up lens is disclosed in patent documentation 1: adopt from object side be followed successively by aperture diaphragm, there are the 1st lens of positive light coke, the 2nd lens of negative power, the 3rd lens and at least 1 mask of positive light coke have aspherical shape and have the concave surface of negative power towards the formation of the 4th lens of object side, and the relation of the radius-of-curvature of the He Xiang side, object side of the 1st power of lens and the 4th lens is set in suitable scope, thereby realize high performance.
In addition, following pick-up lens is disclosed in patent documentation 2: adopt from object side and be followed successively by aperture diaphragm, have the 3rd lens of the 2nd lens, positive light coke of the 1st lens, the negative power of positive light coke and at least 1 for aspheric surface and have the formation of the 4th lens of the concave-concave shape of negative power, and the ratio of the focal length of the focal length of whole system and the 1st lens and the 3rd lens is set in suitable scope, thereby realize high performance.
In addition, following pick-up lens is disclosed in patent documentation 3: configure successively diaphragm from object side, biconvex shape and there are the 1st lens of positive light coke, convex surface is towards object side and have the 2nd lens of the falcate shape of negative power, convex surface is towards as side and have the 3rd lens of the falcate shape of positive light coke, and convex surface is towards object side and have the 4th lens of the falcate shape of negative power, and by the relation of the focal length of the center thickness of the 1st lens and the 1st lens, and the Abbe number of the 2nd lens and the 3rd lens is set in suitable scope, thereby realize high performance.
Formerly technical literature
Patent documentation
Patent documentation 1:JP JP 2008-046526 communique
Patent documentation 2:JP JP 2008-242180 communique
Patent documentation 3:JP JP 2009-014899 communique
Utility model content
The pick-up lens of recording according to above-mentioned patent documentation 1, patent documentation 2, has realized relatively miniaturization.But F value is 3.0 left and right, cannot guarantee fully corresponding lightness of the imaging apparatus growing with high pixelation.In addition, angle of half field-of view is 30 (°, deg) left and right, is not enough to meet the requirement of wide visual field angle.The pick-up lens that patent documentation 3 is recorded has also been realized relatively miniaturization, but F value is 3.2 left and right, cannot reach sufficient lightness.In addition, the correction of the each aberration outside spherical aberration, axle is also insufficient.Thereby, in these prior aries, be difficult to meet the requirement of miniaturization, wide visual field angle, little F value simultaneously.
The utility model completes in view of the above problems, and its object is to provide a kind of pick-up lens, can be corresponding with miniaturization, slimming and less, the each aberration of F value is proofreaied and correct well, field angle is wider and then can be corresponding with cost degradation.
In addition, in the less degree referring to below F2.6 of this said F value, miniaturization, slimming refer to the degree that optical full length is shorter than cornerwise length of effective shooting face of imaging apparatus, wide visual field angle refer under full field angle as approximately 70 (°)～80 (°) degree.
Pick-up lens of the present utility model is a kind of pick-up lens that makes the picture of subject image in the fixed-focus on solid-state imager, from object side towards being formed by following part successively as side: aperture diaphragm; The 1st lens, convex surface, towards object side and picture side, has positive focal power; The 2nd lens, near optical axis, concave surface, towards object side, has negative focal power, and two-sided is aspheric surface; The 3rd lens, near convex surface optical axis is towards the falcate shape of picture side, have positive focal power, and two-sided is aspheric surface; With the 4th lens, for near concave surface optical axis is towards the falcate shape of picture side, there is negative focal power, two-sided is aspheric surface, all lens are formed by plastic material, and meet following conditional (1), (2), (3), (4).
(1)0.56＜r1/f＜1.10
(2)0.86＜f1/f3＜1.41
(3)-5.0＜r3/r4＜0.1
(4)2.0＜r7/r8＜4.8
Wherein,
F: the focal length of whole taking lens system
F1: the focal length of the 1st lens
F3: the focal length of the 3rd lens
R1: the radius-of-curvature of the face of the object side of the 1st lens
R3: the radius-of-curvature of the face of the object side of the 2nd lens
R4: the radius-of-curvature of the face of the picture side of the 2nd lens
R7: the radius-of-curvature of the face of the object side of the 4th lens
R8: the radius-of-curvature of the face of the picture side of the 4th lens
The pick-up lens of above-mentioned formation is made up of positive and negative, positive and negative focal power successively from object side, is to approach the dolly-out, dolly-back arrangement of type of what is called, and be therefore the formation that easily shortens optical full length.In addition,, by suitably distributing each power of lens, forming suitable aspherical shape, shorten optical full length and carry out the correction of each aberration.
The 1st lens are biconvex shape, and positive focal power are suitably assigned to the convex surface of both sides, thereby can the curvature of lens face be set lowlyer, suppress the rising of foozle sensitivity.
In addition, the 1st lens can, in two-sided formation aspheric surface, now can be proofreaied and correct the spherical aberration that the 1st lens produce, and therefore can alleviate the burden of the correction of the 2nd lens.
The chromatic aberation that the 2nd lens correction the 1st lens produce, and pass through in the suitable aspherical shape of two-sided formation, and near the astigmatism outside spherical aberration and the axle of generation, the generation of coma being effectively suppressed on axle.
In addition, the 2nd lens shaped becomes near the face of object side optical axis and the concave-concave shape that is concave surface as the face of side, or the face that is formed as near object side optical axis be concave surface, the falcate shape that is convex surface as the face of side.In addition, make the 2nd lens object side face and be at periphery during to the aspherical shape of object side bending as the face of side, can realize further shortening and the wide visual field angle of optical full length simultaneously.
The 3rd lens and the 4th lens are respectively in the suitable aspheric surface of two-sided formation, thereby be easy to astigmatism outside axis calibration, shorten astigmatic difference, correcting distorted etc., easily control the chief ray incident angle (hereinafter referred to as CRA:Chief Ray Angle) to imaging apparatus simultaneously.
Aperture diaphragm is configured between the circumference of face of the face of object side of the 1st lens and the object side of the position of intersecting point to the of optical axis 1 lens.By the object side at lens system by the position configuration of aperture diaphragm, can make exit pupil position away from image planes, easily make CRA for more subvertical angle.Need to carry out driving with the corresponding system of specification of imaging apparatus for CRA, but be suitable shape by the aspherical shape that makes the 4th lens, make its control become easy.That is, be the aspherical shape to object side bending by the periphery that makes the 4th lens, realize suitable CRA and controlled.At this, the periphery that makes the 4th lens is while following the aspherical shape of change of shape sharply, can strengthen the positive light coke of periphery, thereby can make CRA for more subvertical angle.But, now produce inner face reflected light at the periphery of the face of the picture side of the 4th lens, easily to follow the angle of total reflection to incide the inner face of the face of the object side of the 4th lens.When the light of total reflection arrives image planes, produce ghost phenomena, become the reason that causes image quality deteriorated.As mentioned above, make exit pupil position away from image planes at the object side that depends on most of lens system the position configuration of aperture diaphragm, thereby making in advance CRA is subvertical angle, the burden of the control of the aspherical shape of periphery that therefore can alleviate the 4th lens to CRA, suppresses the generation of ghost phenomena.In addition, the position configuration of aperture diaphragm is being provided with airspace with the 1st lens during further in object side, can make the control of CRA better, but during as lens unit, the lens barrel that forms aperture diaphragm becomes the structure more configuring by object side than the 1st lens, is therefore difficult to miniaturization.
Conditional (1) is for being defined in the radius-of-curvature of the object side of the 1st lens in suitable scope with respect to the value of the focal length of whole taking lens system.The value of conditional (1) is during lower than lower limit, and the positive light coke of the 1st lens became strong, was difficult to proofread and correct each aberration.Otherwise, while exceeding higher limit, a little less than the positive light coke of the 1st lens became, be difficult to shorten optical full length, and be difficult to chromatic aberation on axis calibration, the spherical aberration of lens perimeter portion, coma.
Conditional (2) is for being defined in the relation of the positive light coke of the positive light coke of the 1st lens and the 3rd lens in suitable scope.The value of conditional (2) during lower than lower limit, a little less than the 3rd power of lens became compared with the 1st lens, can not get the effect of the 3rd abundant correction of lens to the curvature of field.Otherwise while exceeding higher limit, the 3rd power of lens became strong compared with the 1st lens, multiplying power chromatic aberation especially increases.
Conditional (3) is for being defined in the face shape of the 2nd lens in suitable scope.Make the negative power of the 2nd lens become strong during lower than the lower limit of conditional (3) and exceed higher limit and while making the negative power of the 2nd lens become weak, destroy with the balance of the suitable focal power of the 1st lens, be difficult to chromatic aberation and multiplying power chromatic aberation on correcting spherical aberration, axle.
About conditional (3), following conditional (3a) is preferred scope.
(3a)-4.0＜r3/r4＜0.05
Conditional (4), for the face shape of the 4th lens is defined in suitable scope, is the condition for suppressing distortion.During lower than the lower limit of conditional (4), exist distortion to be the tendency that winding-type worsens, while exceeding higher limit, exist distortion to be the tendency that barrel shape worsens.By being defined in the scope of conditional (4), can obtain the considerably less image of distortion.
About conditional (4), (4a) shown below is preferred scope.
(4a)2.0＜r7/r8＜4.5
In general, obtain the lens system corresponding with little F value time, the amount that incides the light beam of lens increases, and therefore exists the aberration outside axle to be especially difficult to the tendency of proofreading and correct.But, form and also satisfy condition formula (1)～(4) simultaneously and form optimal aspherical shape at each lens face by said lens, can obtain the pick-up lens that each aberration is proofreaied and correct well in corresponding with little F value.
In addition, pick-up lens of the present utility model preferably meets following conditional (5).
(5)-1.5＜r1/r2＜-0.4
Wherein,
R1: the radius-of-curvature of the face of the object side of the 1st lens
R2: the radius-of-curvature of the face of the picture side of the 1st lens
Conditional (5) is for being defined in the face shape of the 1st lens in suitable scope.During lower than the lower limit of conditional (5), be unfavorable for shortening optical full length, and each aberration worsens.Otherwise while exceeding higher limit, although be conducive to miniaturization, the foozle sensitivity of the face of the object side of the 1st lens uprises, and the tendency that exists each aberration to worsen.
About conditional (5), (5a) shown below is preferred scope.
(5a)-1.20＜r1/r2＜-0.45
In addition, pick-up lens of the present utility model preferably meets following conditional (6).
(6)1.66＜r5/r6＜3.20
Wherein,
R5: the radius-of-curvature of the face of the object side of the 3rd lens
R6: the radius-of-curvature of the face of the picture side of the 3rd lens
Conditional (6) is for being defined in the face shape of the 3rd lens in suitable scope.During lower than the lower limit of conditional (6), the positive focal power of the 3rd lens dies down, and is difficult to spherical aberration and the chromatic aberation of correcting lens periphery.Otherwise, while exceeding higher limit, a little less than the 3rd power of lens became, be difficult to shorten optical full length.If further depart from the lower limit of conditional (6) and the scope of higher limit, be difficult to proofread and correct the distortion in the scope of about 3 one-tenth to 8 one-tenth of image heights.
About conditional (6), (6a) shown below is preferred scope.
(6a)1.80＜r5/r6＜2.90
In addition, pick-up lens of the present utility model preferably meets following conditional (7), (8), (9), (10).
(7)1.50＜Nd1＜1.59
(8)55.0＜νd1＜57.0
(9)1.60＜Nd2＜1.67
(10)23.0＜νd2＜26.0
Wherein,
Nd1: the refractive index of the d line of the 1st lens
ν d1: the Abbe number to d line of the 1st lens
Nd2: the refractive index of the d line of the 2nd lens
ν d2: the Abbe number to d line of the 2nd lens
Conditional (7), (8) are for the refractive index of the 1st lens and Abbe number are defined in suitable scope, and conditional (9), (10) are for being defined in the refractive index of the 2nd lens and Abbe number in suitable scope.These conditionals are for chromatic aberation and multiplying power chromatic aberation and the condition corresponding with low cost on axis calibration well.By the 1st lens and the 2nd lens being defined in to the scope of conditional (7)～(10), correcting chromatic aberration well, and can select plastic material cheaply.
In addition, while making scope in following conditional (11), (12) of the 1st lens and the 2nd refractive index of lens and the relation of Abbe number, correcting chromatic aberration more well.
(11)1.00＜Nd2/Nd1＜1.10
(12)2.1＜νd1/νd2＜2.5
In addition, pick-up lens of the present utility model preferably meets following conditional (13).
(13)0.36＜f12/f34＜2.47
Wherein,
F12: the synthetic focal length of the 1st lens and the 2nd lens
F34: the synthetic focal length of the 3rd lens and the 4th lens
Conditional (13) is for being defined in the synthetic focal length of the 1st lens and the 2nd lens and the ratio of the synthetic focal length of the 3rd lens and the 4th lens in suitable scope.The 1st lens and the 2nd lens greatly contribute to the aberration correction of the pick-up lens such as spherical aberration, chromatic aberation.By by the synthetic Focussing of the synthetic focal length of these 2 pieces of lens and follow-up the 3rd lens and the 4th lens in suitable scope, be easy to realize each aberration calibration result, suppress foozle sensitivity, shorten optical full length.During lower than the lower limit of conditional (13), the synthetic focal length of the 1st lens and the 2nd lens became strong with respect to the synthetic focal length of the 3rd lens and the 4th lens, the tendency that exists aberration that the 1st lens and the 2nd lens produce to increase, cannot be proofreaied and correct completely by the 3rd lens, the 4th lens.Otherwise, while exceeding higher limit, a little less than the synthetic focal length of the 1st lens and the 2nd lens became, be difficult to shorten optical full length.By being defined in the scope of conditional (13), can shortening optical full length and improve optical property.
In addition, pick-up lens of the present utility model preferably meets following conditional (14).
(14)1.80＜f/EPD＜2.60
Wherein,
EPD: the diameter of entrance pupil
Conditional (14), for stipulating the F value of pick-up lens, is the condition of the imaging apparatus for adapting to densification in recent years.There is following tendency in imaging apparatus: Pixel Dimensions is less, and the light quantity being taken into from pick-up lens is lower.Therefore be difficult to obtain bright image.Deal with this problem if will improve sensitivity in imaging apparatus side, because generation noise etc. easily causes image quality deteriorated.Therefore, increase the light quantity penetrating from pick-up lens side and become effective means.By the scope in conditional (14), can obtain bright lens system.
In addition, about conditional (14), following conditional (14a) is preferred scope.
(14a)2.0＜f/EPD＜2.4
According to the utility model, can obtain in corresponding with little F value each aberration by the pick-up lens of that proofread and correct well, small-sized and wide visual field angle.In addition,, by all lens are made up of plastic material, can obtain and can produce in a large number and the pick-up lens of cost degradation.
Accompanying drawing explanation
Fig. 1 is the figure that represents the summary formation of the pick-up lens of embodiment 1.
Fig. 2 is the figure that represents the spherical aberration of the pick-up lens of embodiment 1.
Fig. 3 is the figure that represents the astigmatism of the pick-up lens of embodiment 1.
Fig. 4 is the figure that represents the distortion of the pick-up lens of embodiment 1.
Fig. 5 is the figure that represents the summary formation of the pick-up lens of embodiment 2.
Fig. 6 is the figure that represents the spherical aberration of the pick-up lens of embodiment 2.
Fig. 7 is the figure that represents the astigmatism of the pick-up lens of embodiment 2.
Fig. 8 is the figure that represents the distortion of the pick-up lens of embodiment 2.
Fig. 9 is the figure that represents the summary formation of the pick-up lens of embodiment 3.
Figure 10 is the figure that represents the spherical aberration of the pick-up lens of embodiment 3.
Figure 11 is the figure that represents the astigmatism of the pick-up lens of embodiment 3.
Figure 12 is the figure that represents the distortion of the pick-up lens of embodiment 3.
Figure 13 is the figure that represents the summary formation of the pick-up lens of embodiment 4.
Figure 14 is the figure that represents the spherical aberration of the pick-up lens of embodiment 4.
Figure 15 is the figure that represents the astigmatism of the pick-up lens of embodiment 4.
Figure 16 is the figure that represents the distortion of the pick-up lens of embodiment 4.
Figure 17 is the figure that represents the summary formation of the pick-up lens of embodiment 5.
Figure 18 is the figure that represents the spherical aberration of the pick-up lens of embodiment 5.
Figure 19 is the figure that represents the astigmatism of the pick-up lens of embodiment 5.
Figure 20 is the figure that represents the distortion of the pick-up lens of embodiment 5.
Figure 21 is the figure that represents the summary formation of the pick-up lens of embodiment 6.
Figure 22 is the figure that represents the spherical aberration of the pick-up lens of embodiment 6.
Figure 23 is the figure that represents the astigmatism of the pick-up lens of embodiment 6.
Figure 24 is the figure that represents the distortion of the pick-up lens of embodiment 6.
Figure 25 is the figure that represents the summary formation of the pick-up lens of embodiment 7.
Figure 26 is the figure that represents the spherical aberration of the pick-up lens of embodiment 7.
Figure 27 is the figure that represents the astigmatism of the pick-up lens of embodiment 7.
Figure 28 is the figure that represents the distortion of the pick-up lens of embodiment 7.
Symbol description
ST aperture diaphragm
L1 the 1st lens
L2 the 2nd lens
L3 the 3rd lens
L4 the 4th lens
IR optical filter
Embodiment
Below, with reference to accompanying drawing, the related embodiment of the utility model is elaborated.Fig. 1, Fig. 5, Fig. 9, Figure 13, Figure 17, Figure 21, Figure 25 represent respectively the summary pie graph of the related pick-up lens of the embodiment 1～7 of embodiment of the present utility model.The summary of all embodiment forms identical, therefore mainly with reference to the summary pie graph of embodiment 1, the pick-up lens of present embodiment is elaborated.
As shown in Figure 1, the pick-up lens of embodiment 1 from object side towards being formed by following part successively as side: aperture diaphragm ST; The 1st lens L1, convex surface, towards object side and picture side, has positive focal power; The 2nd lens L2, near optical axis X, concave surface, towards object side, has negative focal power, and two-sided is aspheric surface; The 3rd lens L3, near convex surface optical axis X is towards the falcate shape of picture side, has positive focal power, and two-sided is aspheric surface; With the 4th lens L4, near concave surface optical axis X is towards the falcate shape of picture side, there is negative focal power, two-sided is aspheric surface.This focal power is arranged and is approached the so-called type of dolly-out,ing dolly-back, and is the formation that is easy to shorten optical full length.In addition, the 1st lens L1, the 3rd lens L3, the 4th lens L4 are made up of the plastic material of the cyclenes hydro carbons of low dispersion, and the 2nd lens L2 is made up of the polycarbonate-based plastic material of high dispersion.Between the 4th lens L4 and image planes, dispose the optical filter IR such as infrared intercepting filter.
Be formed for suppressing the aspheric surface of the spherical aberration that the 1st lens L1 produces the 1st lens L1 two-sided, and the value of the paraxial radius-of-curvature of the face r1 of object side is set as to suitable scope with respect to the focal length of whole taking lens system.
The 2nd lens L2 is to be the lens of concave-concave shape near of optical axis X, can effectively proofread and correct the chromatic aberation that the 1st lens L1 produces, and by the suitable aspherical shape of two-sided formation, near the astigmatism outside spherical aberration and axle can effectively suppressing on axle, the generation of coma.In addition, the shape of the 2nd lens L2 is not limited to concave-concave shape.For example, the embodiment 6 shown in Figure 21 is that near the face r3 of object side optical axis X is concave surface, the example of the falcate shape that is convex surface as the face r4 of side.In addition, in the aspherical shape of the two-sided formation of the 2nd lens L2, embodiment 1 such Wei Cong center that can be is as shown in Figure 1 to the shape of periphery even variation, be formed as making also can embodiment 6, embodiment 7 shown in for example Figure 21, Figure 25 the face r3 of object side and the face r4 of picture side in lens perimeter portion to object side bending.While being formed as making the face r3 of object side and the face r4 of picture side bending to object side in lens perimeter portion, not only can be taken into the light from wide visual field angle, can also the interval of the 2nd lens L2 and the 3rd lens L3 be set narrowlyer, therefore can further shorten optical full length.Like this, the 2nd lens L2 especially plays very important effect to the correction of the each aberration with headed by chromatic aberation, and plays very important effect by adopting suitable aspheric surface for miniaturization and the wide visual field angle of realizing pick-up lens simultaneously.
The 3rd lens L3 and the 4th lens L4 be respectively in the suitable aspherical shape of two-sided formation, and be easy to astigmatism outside axis calibration, reduced image scattered error, correcting distorted etc.In addition, the face r8 as side of the 4th lens L4 is the aspherical shape that the position beyond on optical axis X has point of reverse curvature, has the function of controlling CRA.In addition, refer to the point in the aspheric surface that section and optical axis X intersect vertically at this said point of reverse curvature.
Aperture diaphragm ST is configured between the circumference of face r1 of the face r1 of object side of the 1st lens L1 and the object side of position of intersecting point to the 1 lens L1 of optical axis X, thereby makes exit pupil position away from image planes, is easy to make CRA more approaching vertical.In addition, the face r7 of the object side in the periphery of the 4th lens L4 and the face r8 as side are to the aspherical shape of object side bending.This aspherical shape makes the negative power of the 4th lens L4 along with weakening gradually away from optical axis X.Or, make the negative power of the 4th lens L4 along with weakening gradually away from optical axis X, and be changed to positive light coke at periphery.By thering is power variation, can control CRA by the 4th lens L4.And in order to make CRA for more subvertical angle by the aspherical shape of the 4th lens L4, comparatively effective in the time making that especially the aspherical shape of the face r8 as side of the 4th lens L4 sharply changes to object side.,, by strengthening the positive light coke in the periphery of the 4th lens L4, can make CRA for more subvertical angle.But the inner face reflected light now producing at the periphery of the face r8 of the picture side of the 4th lens L4, easily to follow the angle of total reflection to incide the inner face of the face r7 of the object side of the 4th lens L4.When the light of total reflection arrives image planes, can produce ghost phenomena, become the reason that causes image quality deteriorated.In the present embodiment, the object side that leans on most by the position configuration of aperture diaphragm ST at lens system, make exit pupil position away from image planes, thereby making in advance CRA is subvertical angle, the burden that therefore can alleviate the control to CRA of aspherical shape by the periphery of the 4th lens L4, suppresses the generation of ghost phenomena.
The pick-up lens of present embodiment meets following conditional (1)～(14).
(1)0.56＜r1/f＜1.10
(2)0.86＜f1/f3＜1.41
(3)-5.0＜r3/r4＜0.1
(4)2.0＜r7/r8＜4.8
(5)-1.5＜r1/r2＜-0.4
(6)1.66＜r5/r6＜3.20
(7)1.50＜Nd1＜1.59
(8)55.0＜νd1＜57.0
(9)1.60＜Nd2＜1.67
(10)23.0＜νd2＜26.0
(11)1.00＜Nd2/Nd1＜1.10
(12)2.1＜νd1/νd2＜2.5
(13)0.36＜f12/f34＜2.47
(14)1.80＜f/EPD＜2.60
Wherein,
F: the focal length of whole taking lens system
F1: the focal length of the 1st lens L1
F3: the focal length of the 3rd lens L3
R1: the radius-of-curvature of the face r1 of the object side of the 1st lens L1
R2: the radius-of-curvature of the face r2 of the picture side of the 1st lens L1
R3: the radius-of-curvature of the face r3 of the object side of the 2nd lens L2
R4: the radius-of-curvature of the face r4 of the picture side of the 2nd lens L2
R5: the radius-of-curvature of the face r5 of the object side of the 3rd lens L3
R6: the radius-of-curvature of the face r6 of the picture side of the 3rd lens L3
R7: the radius-of-curvature of the face r7 of the object side of the 4th lens L4
R8: the radius-of-curvature of the face r8 of the picture side of the 4th lens L4
Nd1: the refractive index of the d line of the 1st lens L1
ν d1: the Abbe number to d line of the 1st lens L1
Nd2: the refractive index of the d line of the 2nd lens L2
ν d2: the Abbe number to d line of the 2nd lens L2
F12: the synthetic focal length of the 1st lens L1 and the 2nd lens L2
F34: the synthetic focal length of the 3rd lens L3 and the 4th lens L4
EPD: the diameter of entrance pupil
In the present embodiment, all lens faces are formed by aspheric surface.The aspherical shape that these lens faces adopt, the axle of establishing optical axis direction be Z, with the height of the direction of light shaft positive cross be that H, circular cone coefficient are k, asphericity coefficient while being A4, A6, A8, A10, A12, A14, A16, represent by following formula.
[mathematical expression 1]
Next the embodiment of the related pick-up lens of present embodiment is shown.In each embodiment, optical full length, EPD when f represents that focal length, the Fno of whole taking lens system represent that F value, ω represent that angle of half field-of view, ih represent that maximum image height, TTL represent to pull down optical filter IR class represent entrance pupil diameter.In addition, i represents to represent that from face sequence number, the r of object side number radius-of-curvature, d represent that distance (face interval), Nd between the lens face optical axis X represent that the refractive index of d line (reference wavelength), ν d represent the Abbe number to d line.In addition, aspheric surface symbol of additional " * (asterisk) " after face sequence number i is represented.
[embodiment 1]
At lens data basic shown in following table 1.
[table 1]
The pick-up lens of embodiment 1 is as shown in table 8 meets whole conditional (1)～(14).
The pick-up lens of Fig. 2-4 couple embodiment 1 shows respectively spherical aberration (mm), astigmatism (mm), distortion (%).In the spherical aberration diagram of Fig. 2, represent the aberration amount of the each wavelength to F line (486nm), d line (588nm), C line (656nm).In addition, the aberration amount in sagittal image surface S, meridianal image surface T is shown respectively in the astigmatism figure of Fig. 3.As in Figure 2-4, known each aberration is proofreaied and correct well.(in addition, about aberration diagram, also identical in Fig. 6-8 corresponding with embodiment 2～embodiment 7, Figure 10-12, Figure 14-16, Figure 18-20, Figure 22-24, Figure 26-28).
[embodiment 2]
At lens data basic shown in following table 2.
[table 2]
The pick-up lens of embodiment 2 is as shown in table 8 meets whole conditional (1)～(14).
Fig. 6-8 show the aberration diagram of the pick-up lens of embodiment 2.As shown in Fig. 6-8, known each aberration is proofreaied and correct well.
[embodiment 3]
At lens data basic shown in following table 3.
[table 3]
The pick-up lens of embodiment 3 is as shown in table 8 meets whole conditional (1)～(14).
Figure 10-12 show the aberration diagram of the pick-up lens of embodiment 3.As shown in Figure 10-12, known each aberration is proofreaied and correct well.
[embodiment 4]
At lens data basic shown in following table 4.
[table 4]
The pick-up lens of embodiment 4 is as shown in table 8 meets whole conditional (1)～(14).
Figure 14-16 show the aberration diagram of the pick-up lens of embodiment 4.As shown in Figure 14-16, known each aberration is proofreaied and correct well.
[embodiment 5]
At lens data basic shown in following table 5.
[table 5]
The pick-up lens of embodiment 5 is as shown in table 8 meets whole conditional (1)～(14).
Figure 18-20 show the aberration diagram of the pick-up lens of embodiment 5.As shown in Figure 18-20, known each aberration is proofreaied and correct well.
The F value of the related pick-up lens of above embodiment 1～embodiment 5 is 2.0～2.2 and comparatively bright, and realized approximately 70 (°) wide visual field angle.In addition, optical full length is shorter than cornerwise length of effective shooting face of imaging apparatus, has knownly obtained lens system small-sized and that aberration is proofreaied and correct well.
[embodiment 6]
At lens data basic shown in following table 6.
[table 6]
The pick-up lens of embodiment 6 is as shown in table 8 meets whole conditional (1)～(14).
Figure 22-24 show the aberration diagram of the pick-up lens of embodiment 6.As shown in Figure 22-24, known each aberration is proofreaied and correct well.
[embodiment 7]
At lens data basic shown in following table 7.
[table 7]
The pick-up lens of embodiment 7 is as shown in table 8 meets whole conditional (1)～(14).
Figure 26-28 show the aberration diagram of the pick-up lens of embodiment 7.As shown in Figure 26-28, known each aberration is proofreaied and correct well.
The F value of the related pick-up lens of above embodiment 6, embodiment 7 is 2.2 left and right and comparatively bright, and realized approximately 80 (°) wide visual field angle.In addition, compared with embodiment 1～5, optical full length is shorter than cornerwise length of effective shooting face of imaging apparatus, has knownly obtained lens system small-sized and that aberration is proofreaied and correct well.
In the value of conditional (1)～(14) of embodiment 1～7 shown in table 8.
[table 8]
Industry applications
As mentioned above, when pick-up lens related each embodiment is applied to optical system built-in in the camera head that information terminal apparatus such as portable terminal device such as smart mobile phone or portable telephone and PDA (Personal Digital Assistant) growing in miniaturization, slimming etc., game machine or PC etc. carry, can realize miniaturization and the high performance of this camera.
Claims (7)
1. make the picture of subject image in a pick-up lens for the fixed-focus on solid-state imager, it is characterized in that,
From object side towards being formed by following part successively as side: aperture diaphragm; The 1st lens, convex surface, towards object side and picture side, has positive focal power; The 2nd lens, near optical axis, concave surface, towards object side, has negative focal power, and two-sided is aspheric surface; The 3rd lens, near convex surface optical axis is towards the falcate shape of picture side, have positive focal power, and two-sided is aspheric surface; With the 4th lens, near concave surface optical axis is towards the falcate shape of picture side, there is negative focal power, two-sided is aspheric surface,
All lens are formed by plastic material, and meet following conditional:
0.56＜r1/f＜1.10
0.86＜f1/f3＜1.41
-5.0＜r3/r4＜0.1
2.0＜r7/r8＜4.8
Wherein,
F: the focal length of whole taking lens system
F1: the focal length of the 1st lens
F3: the focal length of the 3rd lens
R1: the radius-of-curvature of the face of the object side of the 1st lens
R3: the radius-of-curvature of the face of the object side of the 2nd lens
R4: the radius-of-curvature of the face of the picture side of the 2nd lens
R7: the radius-of-curvature of the face of the object side of the 4th lens
R8: the radius-of-curvature of the face of the picture side of the 4th lens.
2. pick-up lens according to claim 1, is characterized in that, meets following conditional:
-1.5＜r1/r2＜-0.4
Wherein,
R1: the radius-of-curvature of the face of the object side of the 1st lens
R2: the radius-of-curvature of the face of the picture side of the 1st lens.
3. pick-up lens according to claim 1, is characterized in that, meets following conditional:
1.66＜r5/r6＜3.20
Wherein,
R5: the radius-of-curvature of the face of the object side of the 3rd lens
R6: the radius-of-curvature of the face of the picture side of the 3rd lens.
4. pick-up lens according to claim 1, is characterized in that, meets following conditional:
1.50＜Nd1＜1.59
55.0＜νd1＜57.0
1.60＜Nd2＜1.67
23.0＜νd2＜26.0
Wherein,
Nd1: the refractive index of the d line of the 1st lens
ν d1: the Abbe number to d line of the 1st lens
Nd2: the refractive index of the d line of the 2nd lens
ν d2: the Abbe number to d line of the 2nd lens.
5. pick-up lens according to claim 4, is characterized in that, for refractive index and the Abbe number of above-mentioned the 1st lens and above-mentioned the 2nd lens, meets following conditional:
1.00＜Nd2/Nd1＜1.10
2.1＜νd1/νd2＜2.5。
6. pick-up lens according to claim 1, is characterized in that, meets following conditional:
0.36＜f12/f34＜2.47
Wherein,
F12: the synthetic focal length of the 1st lens and the 2nd lens
F34: the synthetic focal length of the 3rd lens and the 4th lens.
7. pick-up lens according to claim 1, is characterized in that, meets following conditional:
1.80＜f/EPD＜2.60
Wherein,
EPD: the diameter of entrance pupil.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-003924 | 2013-01-11 | ||
| JP2013003924A JP6066179B2 (en) | 2013-01-11 | 2013-01-11 | Imaging lens |
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| Publication Number | Publication Date |
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| CN203606553U true CN203606553U (en) | 2014-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320782287.9U Expired - Lifetime CN203606553U (en) | 2013-01-11 | 2013-11-27 | Shooting lens |
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| Country | Link |
|---|---|
| US (1) | US8976464B2 (en) |
| JP (1) | JP6066179B2 (en) |
| CN (1) | CN203606553U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105652420A (en) * | 2014-11-28 | 2016-06-08 | 三星电机株式会社 | Lens module |
| CN106772943A (en) * | 2015-12-29 | 2017-05-31 | 广州市全像光学科技有限公司 | Camera optical camera lens group |
| CN109960009A (en) * | 2017-12-22 | 2019-07-02 | 南昌欧菲光电技术有限公司 | Pick-up lens and electronic device |
| WO2021042304A1 (en) * | 2019-09-04 | 2021-03-11 | 深圳市海谱纳米光学科技有限公司 | Optical lens and optical device |
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| JP2015102849A (en) | 2013-11-28 | 2015-06-04 | カンタツ株式会社 | Image capturing lens |
| CN103969791B (en) * | 2013-12-09 | 2016-05-25 | 玉晶光电(厦门)有限公司 | Optical imaging lens and apply the electronic installation of this camera lens |
| JP6324824B2 (en) * | 2014-06-27 | 2018-05-16 | カンタツ株式会社 | Imaging lens |
| TWI529414B (en) | 2014-12-19 | 2016-04-11 | 玉晶光電股份有限公司 | Optical imaging lens and eletronic device comprising the same |
| TWI588532B (en) * | 2015-12-31 | 2017-06-21 | 新鉅科技股份有限公司 | Four-piece infrared single wavelength lens assembly |
| TWI706156B (en) * | 2016-03-24 | 2020-10-01 | 先進光電科技股份有限公司 | Optical image capturing system |
| TWI626465B (en) * | 2016-03-24 | 2018-06-11 | 先進光電科技股份有限公司 | Optical image capturing system |
| CN113741010A (en) * | 2017-08-08 | 2021-12-03 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| CN115185068B (en) * | 2022-09-12 | 2023-05-30 | 江西联昊光电有限公司 | Optical lens |
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| JP4977869B2 (en) | 2006-08-21 | 2012-07-18 | コニカミノルタアドバンストレイヤー株式会社 | Imaging lens, imaging device, and portable terminal |
| JP2008158413A (en) * | 2006-12-26 | 2008-07-10 | Canon Electronics Inc | Imaging lens and imaging apparatus having same |
| TW200831977A (en) * | 2007-01-23 | 2008-08-01 | Asia Optical Co Inc | Miniature lens |
| JP4924141B2 (en) | 2007-03-28 | 2012-04-25 | コニカミノルタオプト株式会社 | Imaging lens, imaging device, and portable terminal |
| JP4071819B1 (en) | 2007-07-03 | 2008-04-02 | 株式会社小松ライト製作所 | Imaging lens |
| JP5317480B2 (en) * | 2008-01-15 | 2013-10-16 | カンタツ株式会社 | Imaging lens |
| JP2010049113A (en) * | 2008-08-22 | 2010-03-04 | Sony Corp | Image pickup lens and image pickup apparatus |
| KR101503396B1 (en) * | 2009-02-16 | 2015-03-18 | 삼성테크윈 주식회사 | Lens system |
| JP5424815B2 (en) * | 2009-10-22 | 2014-02-26 | オリンパス株式会社 | Imaging optical system and imaging apparatus having the same |
| US9182576B2 (en) * | 2010-02-08 | 2015-11-10 | Panasonic Intellectual Property Management Co. Ltd. | Image pickup lens, image pickup device using same, and portable apparatus equipped with the image pickup device |
| JP2012073535A (en) * | 2010-09-29 | 2012-04-12 | Sony Corp | Imaging lens and imaging apparatus |
| JP5830853B2 (en) * | 2010-12-14 | 2015-12-09 | ソニー株式会社 | Imaging lens and imaging apparatus |
| JP5589815B2 (en) * | 2010-12-14 | 2014-09-17 | ソニー株式会社 | Imaging lens and imaging apparatus |
| CN103076669B (en) * | 2012-07-20 | 2015-05-13 | 玉晶光电(厦门)有限公司 | Portable electronic device and optical imaging lens thereof |
| CN103123414A (en) * | 2012-11-15 | 2013-05-29 | 玉晶光电(厦门)有限公司 | Portable electronic device and optical imaging lens of portable electronic device |
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2013
- 2013-01-11 JP JP2013003924A patent/JP6066179B2/en active Active
- 2013-11-04 US US14/071,042 patent/US8976464B2/en active Active
- 2013-11-27 CN CN201320782287.9U patent/CN203606553U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105652420A (en) * | 2014-11-28 | 2016-06-08 | 三星电机株式会社 | Lens module |
| CN105652420B (en) * | 2014-11-28 | 2019-04-02 | 三星电机株式会社 | Lens module |
| CN106772943A (en) * | 2015-12-29 | 2017-05-31 | 广州市全像光学科技有限公司 | Camera optical camera lens group |
| CN109960009A (en) * | 2017-12-22 | 2019-07-02 | 南昌欧菲光电技术有限公司 | Pick-up lens and electronic device |
| WO2021042304A1 (en) * | 2019-09-04 | 2021-03-11 | 深圳市海谱纳米光学科技有限公司 | Optical lens and optical device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2014134741A (en) | 2014-07-24 |
| US20140198397A1 (en) | 2014-07-17 |
| JP6066179B2 (en) | 2017-01-25 |
| US8976464B2 (en) | 2015-03-10 |
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Effective date of registration: 20210820 Address after: Tokyo Patentee after: Tokyo chenmei Optical Electronics Co.,Ltd. Address before: Japan Tochigi Patentee before: Kantatsu Co.,Ltd. |
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